#include <stdio.h>

int main(void)
{
    char ch;
    int a_ct, e_ct, i_ct, o_ct, u_ct;
    a_ct = e_ct = i_ct = o_ct = u_ct = 0;
    printf("Enter some text; enter # to quit.\n");
    while ((ch = getchar()) != '#')
    {
        switch (ch)
        {
            case 'a':
            case 'A':
                a_ct++;
                break;
            case 'e':
            case 'E':
                e_ct++;
                break;
            case 'i':
            case 'I':
                i_ct++;
                break;
            case 'o':
            case 'O':
                o_ct++;
                break;
            case 'u':
            case 'U':
                u_ct++;
                break;
            default:
                break;
        } // switch结束
    } // while循环结束
    printf("number of vowels: A E I O U\n");
    printf(" %4d %4d %4d %4d %4d\n", a_ct, e_ct, i_ct, o_ct, u_ct);
    return 0;
}
